Pinpoint Test I: Poor Image Quality
Parking Aid - Video
Pinpoint Tests
Pinpoint Test I: Poor Image Quality
Refer to Wiring Diagram Set 131, Parking Aid for schematic and connector information. Diagrams By Number
Normal Operation
A pair of shielded wires carries the video signal from the rear video camera and displays an image on the left portion of the auto-dimming interior mirror (for vehicles without navigation) or in the display of the ACM (for vehicles with navigation). The rear video system provides a clear image of objects to the rear of the vehicle.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Video camera
PINPOINT TEST I: POOR IMAGE QUALITY
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
NOTE: Failure to disconnect the battery when instructed results in false resistance readings. Refer to Battery, Mounting and Cables Battery Disconnect / Connect.
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I1 CHECK AND CLEAN THE REAR VIDEO CAMERA LENS
- Clean and make sure the rear video camera lens is clear of any debris.
- Test the video camera system and verify the video camera image.
- Is the video camera concern still present?
Yes
GO to I2.
No
The system is operating correctly at this time. The concern was caused by a dirty video camera lens.
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I2 CHECK THE VIDEO SIGNAL CIRCUITS INTEGRITY
- Ignition OFF.
- Disconnect: Auto-Dimming Interior Mirror C911 (Without Navigation) or ACM C240b (With Navigation).
- For vehicles without navigation, measure the resistance between the auto-dimming interior mirror C911-8, circuit VMP19 (WH/GN), harness side and the auto-dimming interior mirror C911-16, circuit RMP19 (BN/VT), harness side.
- For vehicles with navigation, measure the resistance between the ACM C240b-1, circuit VMP19 (WH/GN), harness side and the ACM C240b-6, circuit RMP19 (BN/VT), harness side.
- Is the resistance between 74 and 106 ohms?
Yes
GO to I8.
No
GO to I3.
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I3 CHECK THE VIDEO CAMERA GROUND CIRCUIT FOR AN OPEN
- Disconnect: Negative Battery Cable.
- Disconnect: Video Camera C4357 .
- Measure the resistance between the video camera C4357-6, circuit GD122 (BK/WH), harness side and ground.
- Is the resistance less than 5 ohms?
Yes
GO to I4.
No
REPAIR the circuit. CONNECT the negative battery cable. TEST the system for normal operation.
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I4 CHECK THE VIDEO CAMERA SIGNAL CIRCUITS FOR A SHORT TO GROUND
- Measure the resistance between the video camera C4357-4, circuit VMP19 (WH/GN), harness side and ground; and between the video camera C4357-5, circuit RMP19 (BN/VT), harness side and ground.
- Are the resistances greater than 10,000 ohms?
Yes
GO to I5.
No
REPAIR the circuit in question. TEST the system for normal operation.
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I5 CHECK THE VIDEO CAMERA VIDEO SIGNAL CIRCUITS FOR A SHORT TO VIDEO SHIELD
- Measure the resistance between the video camera C4357-4, circuit VMP19 (WH/GN), harness side and the video camera C4357-2, circuit DMP19 (BK), harness side.
- Measure the resistance between the video camera C4357-5, circuit RMP19 (BN/VT), harness side and the video camera C4357-2, circuit DMP19 (BK), harness side.
- Are the resistances greater than 10,000 ohms?
Yes
GO to I6.
No
REPAIR the circuit in question. TEST the system for normal operation.
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I6 CHECK VIDEO SIGNAL CIRCUITS FOR AN OPEN
- Connect a fused jumper wire between the video camera C4357-4, circuit VMP19 (WH/GN), harness side and the video camera C4357-5, circuit RMP19 (BN/VT), harness side.
- For vehicles without navigation, measure the resistance between the auto-dimming interior mirror C911-8, circuit VMP19 (WH/GN), harness side and the auto-dimming interior mirror C911-16, circuit RMP19 (BN/VT), harness side.
- For vehicles with navigation, measure the resistance between the ACM C240b-1, circuit VMP19 (WH/GN), harness side and the ACM C240b-6, circuit RMP19 (BN/VT), harness side.
- Is the resistance less than 5 ohms?
Yes
REMOVE the jumper wire. GO to I8.
No
REMOVE the jumper wire. GO to I7.
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I7 CHECK VIDEO (+) SIGNAL CIRCUIT FOR AN OPEN
- For vehicles without navigation, measure the resistance between the auto-dimming interior mirror C911-8, circuit VMP19 (WH/GN), harness side and the video camera C4357-4, circuit VMP19 (WH/GN), harness side.
- For vehicles with navigation, measure the resistance between the ACM C240b-1, circuit VMP19 (WH/GN), harness side and the video camera C4357-4, circuit VMP19 (WH/GN), harness side.
- Is the resistance less than 5 ohms?
Yes
REPAIR circuit RMP19 (BN/VT). TEST the system for normal operation.
No
REPAIR circuit VMP19 (WH/GN). TEST the system for normal operation.
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I8 CHECK FOR CORRECT VIDEO CAMERA OPERATION
- Connect all disconnected connectors.
- Disconnect the video camera connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the video camera connector and make sure it seats correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes
INSTALL a new video camera. REFER to Video Camera Service and Repair. TEST the system for normal operation.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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